Bearing device for vehicle wheel

Abstract

Provided is a bearing device for a vehicle wheel comprising: an outer-side seal that is resistant to deterioration over time and can prevent foreign matter. This bearing device for a vehicle wheel comprises an outer-side seal member 7 that closes an outer-side opening end of an annular space formed by an outer ring 2 and a hub ring 3 . The outer-side seal member 7 including a core metal 8 which is fitted to the outer ring 2 , a seal member 10 which is joined to the core metal 8 , and a metal ring 9 which is fitted to the hub ring 3 and with which the seal member 10 is in sliding contact. An annular space S is provided between the metal ring 9 and the hub ring 3 , and the annular space S being filled with a sealing material 20.

The invention claimed is: 
     
       1. A bearing device for a vehicle wheel, the bearing device comprising:
 an outer member which has a plurality of rows of outer raceway surfaces provided on an inner periphery; 
 an inner member which includes a hub ring and at least one inner ring, the hub ring having a small-diameter step portion that is provided on an outer periphery and extends axially and a vehicle wheel mounting flange that is disposed on an outer side with respect to the small-diameter step portion, the at least one inner ring being press-fitted to the small-diameter step portion of the hub ring, and the inner member having a plurality of rows of inner raceway surfaces that are provided on an outer periphery and face the plurality of rows of outer raceway surfaces; 
 a plurality of rows of rolling elements that are rollably accommodated between the inner raceway surfaces of the inner member and the outer raceway surfaces of the outer member; 
 an outer-side seal member that closes an outer-side opening end of an annular space formed by the outer member and the inner member, the outer-side seal member including a core metal which is fitted to the outer member, a seal member which is joined to the core metal, and a metal ring which is fitted to the hub ring of the inner member and with which the seal member is in sliding contact; and 
 a rubber member that is provided radially outside the metal ring and is in contact with the vehicle wheel mounting flange of the hub ring, 
 wherein an annular space is provided between a radially inside end portion of the rubber member, the metal ring and the hub ring, and the annular space is filled with a filler. 
 
     
     
       2. The bearing device for a vehicle wheel according to  claim 1 , wherein the filler is a sealing material. 
     
     
       3. The bearing device for a vehicle wheel according to  claim 1 , wherein a portion of the metal ring between a portion of the metal ring fitted to the hub ring and a portion of the metal ring facing the vehicle wheel mounting flange is formed linearly in a cross-sectional view. 
     
     
       4. The bearing device for a vehicle wheel according to  claim 2 , wherein a portion of the metal ring between a portion of the metal ring fitted to the hub ring and a portion of the metal ring facing the vehicle wheel mounting flange is formed linearly in a cross-sectional view.